Visor



FIG. 1 is a front and right-side perspective view of a visor showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof, the left side being a mirror image; and,

FIG. 4 is a top plan view thereof.

The helmet and hook and loop fasteners shown in broken lines form no part of the claimed design. 

The ornamental design for a visor, as shown and described. 